Whitmoreite Mineral Data

Whitmoreite Mineral Data +

General Whitmoreite Information

Chemical Formula:

Fe++Fe+++2(PO4)2(OH)2·4(H2O)

Composition:

Molecular Weight = 463.56 gm

Iron 36.14 % Fe 46.50 % FeO

Phosphorus 13.36 % P 30.62 % P₂O₅

Hydrogen 2.17 % H 19.43 % H₂O

Oxygen 48.32 % O

______ ______

100.00 % 96.55 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Fe²⁺₂(PO₄)₂(OH)₂·4(H₂O)

Environment:

Hydrothermal alteration product of triphylite in cavities in quartz-bearing pegmatite.

IMA Status:

Approved IMA 1974

Locality:

Palermo No. 1 mine, North Groton, New Hampshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Robert W. Whitmore (1936-), Micromount mineral collector and owner of the Palermo mine, New Hampshire, USA.

Synonym:

ICSD 6202

PDF 26-1138

Whitmoreite Image

Images:

Whitmoreite

Comments: Two stellate crystal clusters of whitmoreite.
Location: Big Chief mine, Keystone, Penninton County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Whitmoreite Crystallography

Axial Ratios:

a:b:c =1.0277:1:0.5622

Cell Dimensions:

a = 10, b = 9.73, c = 5.471, Z = 2; beta = 93.8° V = 531.16 Den(Calc)= 2.90

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.05(1), 4.98(0.7), 7.01(0.7),

Crystal Structure:

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Moore P B , Kampf A R , Irving A J , American Mineralogist , 59 (1974) p.900-905, Whitmoreite, FeFe2(OH)2(H2O)4[PO4]2, a new species: Its description and atomic, arrangement

Physical Properties of Whitmoreite

Cleavage:

[100] Good

Color:

Brown, Greenish brown, Light yellow brown, Dark brown.

Density:

2.87

Diaphaniety:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luster:

Vitreous - Adamantine

Optical Properties of Whitmoreite

Gladstone-Dale:

CI meas= -0.19 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.177 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2467,KPDmeas= 0.2492,KC= 0.2095

Optical Data:

Biaxial (-), a=1.676, b=1.725, g=1.745, bire=0.0690, 2V(Calc)=62, 2V(Meas)=60-65.

Pleochroism (x):

light green brown.

Pleochroism (y):

light green brown.

Pleochroism (z):

dark green brown.

Calculated Properties of Whitmoreite

Electron Density:

r_electron=2.88 gm/cc
note: r_Whitmoreite=2.90 gm/cc.

Fermion Index

Fermion Index = 0.00789
Boson Index = 0.99211

Photoelectric:

PE_Whitmoreite= 11.30 barns/electron
U=PE_Whitmoreite x r_electron= 32.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Whitmoreite is Not Radioactive

Whitmoreite Classification

Dana Class:

42.11.18.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.18)Dana Group

42.11.18.1 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

42.11.18.2 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2·4(H2O) P 2₁/c 2/m

42.11.18.3 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

42.11.18.4 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

42.11.18.5 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13·H2O P 2₁/n 2/m

42.11.18.6 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.08-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.08 - Arthurite group

VII/D.08-10 Kleemanite ZnAl2(PO4)2(OH)2·3(H2O) P 2, P 2₁, P 2/m or P 2₁/m Mono

VII/D.08-20 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-30 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-40 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-45 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-50 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-60 Mapimite Zn2Fe3(AsO4)3(OH)4·10(H2O) Cm m

Other Whitmoreite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Whitmoreite

Fe++Fe+++2(PO4)2(OH)2·4(H2O)
Dana No: 42.11.18.1 Strunz No: VII/D.08-20
Locality:

Notes: